getSecurityInfo for PWAs?

For websites such as, that replace the browser’s normal navigation with pure Service Worker interception of all requests, how can one getSecurityInfo the initial page-load (especially after a browser restart)?

The browser itself seems to consider the website “secured”, and provides the securing certificate’s information in the URL bar, even if the entire session at the website was served offline by a Service Worker, so how can I access that security information from an extension?

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